This study reports on developing and validating the School Alienation in Online Schooling Scale (SAOSS). School alienation in online schooling is conceptualized as opposed to school belonging and the main reason for minimal participation, reduced educational benefits, and school dropout in school aged-children, especially during the online learning forced due to the COVID-19 Pandemic. This study includes three phases. The first study included item generation and analysis. After the initial analysis, 13 items from the tool were retained. In the second study, exploratory factor analysis was conducted. Two factors emerged from principal component analysis (PCA). In the third study, we investigated the confirmatory factor analysis of SAOSS with a sample of urban students in Iran (grades 7-9, n = 317). The SAOSS has important implications for researchers, school counselors and psychologists, policymakers, and stakeholders. Implication for theory, practice and future research is discussed.